Vane series for turbines.



1?. LJUNGSTRfiM. VANE SERIES FOR TURBIRES. APPLICATION FILED MAY 10. 1907 Patented Feb. 9, 1909 maw '2 SHEETS-SHEET 1,

vsmon @1971 WITNESSES.

' 6/5 ATTORNEY- B. LJUNGSTRGM. VANE SERIES FOR TURBINES. APPLICATION FILED MAY 10. 1907v Patented Feb. 9, 1909.

2 SHEETS-SHEET 2.

11s AimRNEY in connection with the former, wherein, as. 18 Well understood, the speed of rotation and BIRGER IJUNGSIRUM, ()F STOOKHOLM, SWEDEN.

VANE FGR 'E'URBINES.

Specification of Letters Patent. dppliciition filed lllsy 10, 1907. Serial No. 372,994.

' ilPatented. Feb. 9, 19%.

following to be a full, clear, andexact de-.

scriotion of the invention, such as will enable others skilled in the art to which it sppertains to make and use the same, ref erence being had to the .accorn 'ianying drawings, and to letters or figures of refer ence marked thereon, which form a part of this specification.

flhis invention relates to the manufacture of vane-series for gas turbines; my object herein being to produce, in a simple and efiicient manner, a unitary vane structure of relatively great strength, which can be readily applied to or removed from the rotating or iii-red parts of a turbine, as occasion may require. i

in carrying out my invention the respective ends oi the vanes or blades are joined with thin metallic supporting strips, and the latter are then rig-idly sourced to stout stillening' rings, will be hereinafter more particularl described and then duly claimed.

W ilc the structure produced according to my invention is applicable to both radial and axial turbines, it is particularly useful the resulting dimensions and economy ,oi' theapparatus depend upon the efiiciency ol the connection between the vanes and their ring-bonds, inasmuch as the centrifuged forcedue to the operation of the vanes is taken up entirely by such bonds.

In the annexed drawilws, Figure l is a i. I I.) o horizontal section through a portion of the thin supporting strip with several blades or vanes applied thereto, with projecting ends, the same being illustrative of the assembling operation. 2 is a vertical section through such blade: or vanes showing the supporting strip the .cl'or in elevation. Fig. 3 is a similar sectir n showing the edges of the supportin strip reduced to the edges of the blades or vanes. Fig. 4 is a plan of a portion of the completed vane structure showing two series of assembled vanes with the stiffening rings combined therewith.

. Fig. 5 a vertical section ofFig. 4. Fig. 6

isfisimilar section showing one mode of securing the stiffening rings to the supporting strips for the blades or vanes. Fig. '7 is c. section similar to Fig. 1, showing the ends of the blades or vanes flush with the outer surface of the supporting strip. Fig. Sis a. like section, enlarged, showing the ends of the blades or vanes terminating within the supporting, strip, and also showing the stiff ening ring. Fig. 9 is a transverse section through the inner supporting strips of two series of blades or vanes and the interposed stiffening ring, showing the lateral edges 01' the supporting strips as flanged or bent into locking engs einent with. the stiffening ring. Fig. 10 is a. 1 orizontal section through one of thesu'pporting strips with its blades or vanes, the section being taken on a plane hn inediately above the stiffening ring in Fig.

9. Fig. 11 is a View similar to Fig. 4, showing a vane structure designed for an axial turbine.

In the drawings, 1 indicates the blades or vanes; 3 the thin supporting strips in which the ends of the blades or vanes are mounted, and 4 the stout stifiening rings to which the said strips, With their blades or vanes, are rigidly ailixed.

, in the manufacture of vane series for radial turbines, the parts 3 are first made in straight strips with appro )riate perforations,

as 2, into which the on s of the blades or vanes are inserted and secured, which strips are thereupon bent into the desired circular or segmental form. The vane ends are then Welded to the strips through the medium. of a suitable blow-pipe or an electric voltaic arc. if desired, the vane ends may be caused to project slightly beyond the surface of tho-strip, as in Fig. 1, and be sinelted thereto.

4, 'wl'iich constitute an effective stiffening and reinforcing bond for the structure. This being done, the projecting edges of the strips 3, and all other superfluous portions of the structure, may be romoi by grinding, turning' or otherwise finishing the same,

as indicated by the dotted lines in Fig. 3. The assembled blades or vanes ailiXcd to the stiffening rings 4: by welding or soldering, in which. case, as indicated iii Fig. 6, the said rings may be conveniently provided with grooves or notches, us st 5, for the reception of the molten metal. /Vhere may i be The vane supporting strips are 'l'lgldly aihxed to the thicker ring members the vene series are siiixed to the stiffening rings by soldering, the welding of the vane en 5 to their supporting strips, may be omitted, inasmuch as during the soldering operation the solder will fiow into the holes or the supportingwtrips -end envelop the vane ends therein. In that case, the vane ends, instead of projecting beyond the surfe -3e of the strip, should either be flush with the same, as in 7 or lie within the strip,

not essentiel that the union of the Wine series with the stifiening rings be efiectedby soldering or welding, as in pursilence of my invention, 1 can e ectuelly unite the contiguoussupporting and stiffening rings by correspondingly reducing the Width of the vene ends and the length it series of vanes, thin'strips fixedly oining the ends of said vanes, end stiffening rings to which said strips are rigidly secured.

2. A unitery vane structure comprising e plurality of series of vanes, thin strips fixedly joining the ends of the respective series, and on interposed sti ing ring to which the strips of adjoiningseries are rigidly secured.

3. A. unitary vane structure comprising a. series of vanes, thin strips joining the ends of said vanes, and stiilening rings with which said strips are bent into locking engagement.

4. A unitery vene structure coniprishig s plurality of series of vanes, thin strips Fig. 9) and emcee joining the ends of the respective series, and. on interposed stiffening ring with which the strips of adjoining series are bent into locking engagement.

5. A unitary vane structure comprising a series of vanes, thin strips provided with perforations in which the ends of said vanes are entered and fixedly secured, and stiflening rings to which said strips are rigidly secured.

6. A unitary vane structure comprising e series of vanes, thin strips ju'oyided with perforations in which the ends oi said vanes are entered and secured, and still'onin; rings with which the edges of the strips are bent into locking engagement.

7 A unitary vane structure comprising a. plurality ofscries of vanes, thin strips joining the ends of the respective series, said strips being kprovided with perforations in Which the on s of the vanes are entered and secured, and 9.11 interposed stiileuing ring With which. the strips of i djoiningg series are bent into locking engagement.

8. A unitcry one structure comprising at series of vanes, thin strips to which the ends of the runes are welded snid strips being provided with perforations which receive the ends of the runes, :rnu stiil'eniiu: rings ith which the said strips are bent into locking engagement.

9. A. unitary vane structure mniprisiug it plurality ,of series of vanes, thin strips to which the ends of the rcspuctixe series are Welded, said strips being provided with purforetions which receive the ends of the venue, and on intrrposed stiffening: ring with which the strips of adjoining series are bent into locking engagement.

In testimony, that l claim the foromtiug es invention, 1 here s 10d my more presence of two subscribing \YllllUSfl-H.

5 El liGEli Ll UN (-tl'llh id.

ll itnesscs CARL Fnnxnne, it. lliinnne. 

